Why does this works perfectly fine on iPhone but crashes on ipad

import SwiftUI
import MessageUI

struct ContactDetailView: View {
    let contact: ContactEntity

    @EnvironmentObject var vm: CoreDataViewModel

    @State private var showCompanyConnection = false

    @State private var showJobConnection = false
    @State private var showingAddJobScreen = false
    @State private var currentSelectedJob: Int = 0

    @State var result: Result<MFMailComposeResult, Error>?
    @State var msgBody: String?
    @State private var isShowingMailView = false

    var body: some View {
        VStack {
            ContactHeaderComponent(firstName: contact.firstName ?? "", lastName: contact.lastName ?? "")
                .frame(height: 50)
            NavigationLink {
                ContactDetailView(contact: contact)
            } label: {
                Text(contact.company?.companyName ?? "")
                    .font(.callout)
                    .foregroundColor(.secondary)
            }
            Spacer()

            List {                
                // MARK: Contact Information
                Section {
                    HStack {
                        Image(systemName: "phone")
                        Spacer()
                        if (contact.phoneNumber != "") || (contact.phoneNumber != nil) {
                            let numberString = contact.phoneNumber!
                            Button {
                                let telephone = "tel://"
                                let formattedString = telephone + numberString
                                guard let url = URL(string: formattedString) else { return }
                                UIApplication.shared.open(url)
                            } label: {
                                Text(numberString)
                            }
                        } else {
                            Text("")
                        }
                    }
                    HStack {
                        Image(systemName: "envelope")
                        Spacer()
                        Button {
                            isShowingMailView.toggle()
                        } label: {
                            Text(contact.emailAdress ?? "")
                        }
                    }
                }

                // MARK: Add Job
                Section(header: Text(StringConstants.addJobs)) {
                    Toggle(StringConstants.addConnectionJobC, isOn: $showJobConnection)

                    if showJobConnection {
                        HStack {
                            Picker(selection: $currentSelectedJob, label: Text(StringConstants.selectedJobc)) {
                                ForEach(0 ..< vm.jobs.count, id: \.self) {
                                    Text(LocalizedStringKey((self.vm.jobs[$0].jobTitle ?? "") + " at " +  (self.vm.jobs[$0].company?.companyName ?? "")))
                                }
                            }
                        }
                        Button {
                            showingAddJobScreen.toggle()
                        } label: {
                            Label(StringConstants.addNewJobC, systemImage: "plus.circle")
                        }

                        Button {
                            if vm.contacts.firstIndex(of: contact) != nil {
                                vm.addJobToContact(contactIndex: vm.contacts.firstIndex(of: contact)!, jobIndex: currentSelectedJob)
                            }
                            showJobConnection.toggle()
                        } label: {
                            Text(StringConstants.saveConnection)
                        }
                    }
                }

                // MARK: Exisiting Jobs
                Section(header: Text(StringConstants.jobsC)) {
                    if let jobs = contact.jobs?.allObjects as? [JobEntity] {
                        ForEach(jobs) { job in
                            NavigationLink {
                                JobDetailView(job: job)
                            } label: {
                                VStack(alignment: .leading) {
                                    Text(job.jobTitle ?? "")
                                    Text(StringConstants.status + ": " + (job.status ?? ""))
                                        .font(.caption)
                                }
                            }
                        }
                    }
                }
            }
        }
        .toolbar(content: {
            ToolbarItem(placement: .navigationBarTrailing) {
                NavigationLink {
                    if vm.contacts.firstIndex(of: contact) != nil {
                        ContactDetailEditView(contactIndex: vm.contacts.firstIndex(of: contact)!, model: contact)
                            .environmentObject(vm)
                    }
                } label: {
                    Text(StringConstants.edit)
                }
            }
        })
        .sheet(isPresented: $showingAddJobScreen) {
            AddJobView()
        }
        .sheet(isPresented: $isShowingMailView) {
            MailView(result: self.$result, recipients: contact.emailAdress ?? "")
        }
    }
}

ERROR: Thread 1: Fatal error: No ObservableObject of type CoreDataViewModel found. A View.environmentObject(_:) for CoreDataViewModel may be missing as an ancestor of this view.

On vm in (all the way down)

if vm.contacts.firstIndex(of: contact) != nil {
                        ContactDetailEditView(contactIndex: vm.contacts.firstIndex(of: contact)!, model: contact)
                            .environmentObject(vm)
                    }

I have to mention that the direct parent view on iPhone is a navigationView, on iPad it isn't (it uses a sie bar and on the grand-parent)

For iPad perhaps you have to pass the CoreDataViewModel further up the view hierarchy in your environment.

The CoreDataViewModel is passed in on the top level with:

.environmentObject(vm)

and that with every level below.

If i change it to this for the ipad:

private var iPadView: some View {
        VStack {
            ContactHeaderComponent(firstName: contact.firstName ?? "", lastName: contact.lastName ?? "")
                .frame(height: 50)
            NavigationLink {
                ContactDetailView(contact: contact)
            } label: {
                Text(contact.company?.companyName ?? "")
                    .font(.callout)
                    .foregroundColor(.secondary)
            }
            Spacer()

            List {
                // MARK: Contact Information
                Section {
                    HStack {
                        Image(systemName: "phone")
                        Spacer()
                        if (contact.phoneNumber != "") || (contact.phoneNumber != nil) {
                            let numberString = contact.phoneNumber!
                            Button {
                                let telephone = "tel://"
                                let formattedString = telephone + numberString
                                guard let url = URL(string: formattedString) else { return }
                                UIApplication.shared.open(url)
                            } label: {
                                Text(numberString)
                            }
                        } else {
                            Text("")
                        }
                    }
                    HStack {
                        Image(systemName: "envelope")
                        Spacer()
                        Button {
                            isShowingMailView.toggle()
                        } label: {
                            Text(contact.emailAdress ?? "")
                        }
                    }
                }

                // MARK: Add Job
                Section(header: Text(StringConstants.addJobs)) {
                    Toggle(StringConstants.addConnectionJobC, isOn: $showJobConnection)

                    if showJobConnection {
                        HStack {
                            Picker(selection: $currentSelectedJob, label: Text(StringConstants.selectedJobc)) {
                                ForEach(0 ..< vm.jobs.count, id: \.self) {
                                    Text(LocalizedStringKey((self.vm.jobs[$0].jobTitle ?? "") + " at " +  (self.vm.jobs[$0].company?.companyName ?? "")))
                                }
                            }
                        }
                        Button {
                            showingAddJobScreen.toggle()
                        } label: {
                            Label(StringConstants.addNewJobC, systemImage: "plus.circle")
                        }

                        Button {
                            if vm.contacts.firstIndex(of: contact) != nil {
                                vm.addJobToContact(contactIndex: vm.contacts.firstIndex(of: contact)!, jobIndex: currentSelectedJob)
                            }
                            showJobConnection.toggle()
                        } label: {
                            Text(StringConstants.saveConnection)
                        }
                    }
                }

                // MARK: Exisiting Jobs
                Section(header: Text(StringConstants.jobsC)) {
                    if let jobs = contact.jobs?.allObjects as? [JobEntity] {
                        ForEach(jobs) { job in
                            NavigationLink {
                                JobDetailView(job: job)
                            } label: {
                                VStack(alignment: .leading) {
                                    Text(job.jobTitle ?? "")
                                    Text(StringConstants.status + ": " + (job.status ?? ""))
                                        .font(.caption)
                                }
                            }
                        }
                    }
                }
            }
        }
        .toolbar {
            ToolbarItem(placement: .navigationBarTrailing) {
                Button {
                    showingContactEditView.toggle()
                } label: {
                    Text(StringConstants.edit)
                }
            }
        }
        .sheet(isPresented: $showingAddJobScreen) {
            AddJobView()
        }
        .sheet(isPresented: $isShowingMailView) {
            MailView(result: self.$result, recipients: contact.emailAdress ?? "")
        }
        .sheet(isPresented: $showingContactEditView) {
            if vm.contacts.firstIndex(of: contact) != nil {
                ContactDetailEditView(contactIndex: vm.contacts.firstIndex(of: contact)!, model: contact)
                    .environmentObject(vm)
            }
        }
    }

It shows the ContactDetailView, but when you hit the edit button the sheet isn't presented. It crashes and gives the following error: "Thread 1: Fatal error: No ObservableObject of type CoreDataViewModel found. A View.environmentObject(_:) for CoreDataViewModel may be missing as an ancestor of this view."